Hue-discrimination functions were derived from hue-naming data ( $480–620\mathrm{nm}$ , $20\mathrm{nm}$ steps) obtained in $4\min$ intervals from $4\min$ to $28\min$ postbleach at $10°$ temporal retinal eccentricity. Hue-naming data were also obtained in the fovea. Hue-discrimination functions derived at the 4, 8, and $12\min$ intervals were very similar to those derived in the fovea. As time postbleach exceeded $12\min$ and rod sensitivity increased, the shape of the hue- discrimination functions changed. Most notably, the minimum between $560–580\mathrm{nm}$ disappeared and the just noticeable differences (JNDs) for the longer wavelength stimuli increased. The long-wavelength suppression in hue discrimination may be due to rod input in the magnocellular pathway interacting and affecting the long- wavelength sensitivity of the parvocellular pathway.

© 2011 Optical Society of America

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